If you want to enable Debug mode, open the editor and go to "Scenario Properties" (or press alt-enter). Adjacent to "Map Options", there's a little box that says "Debug mode". Check it.
With debug mode enabled, you can use the following cheats in your scenario according to the CivX Edit help:
Shift + F1" - Select a unit to place on the map
$" - Adds 100 Gold
At the City Screen: "a" - Adds 1 Population
At the City Screen: "b" - Adds an improvement
At the City Screen: "s" - Adds 100 Shields
At the Science Advisor Screen: "Shift + Right-Click" researches the selected (clicked) tech
At the Science Advisor Screen: "+" (or "=") researches all of the techs for the current era.
I haven't tried the debug mode yet, but it does look mighty interesting.